WEBVTT HEY TRIED TOSTAY CALM.>> I WENT DOWN 100 TIMES.REPORTER: KEVIN KNOWS THE TRAILTHROUGH THE RESERVATION BETTERTHAN MOST.>> THAT LEADS TO WHERE THETORNADO DICTION.REPORTER: IN FACT, HE BUILT THISBRIDGE WITH HIS OWN STEPFATHERYEARS AGO.>> JUMP OVER.REPORTER: WHICH IS WHY HE MADESURING THE 220 ACRES IN SOUTHBRIDGE ARE A BIG PART OF HIS OWNSTEPSON'S CHILDHOOD.>> IT NICE AND PEACEFUL.REPORTER: BUT TUESDAY EVENING,HE WAS CAUGHT OFF-GUARD.THE RIVERS HAD SWOLLEN FORCINGTHEM TO DETOUR INTO PARTS OFUNKNOWN WHILE THE FRANTIC WIFEWHO HAD RETURNED TO BRING HERFAMILY HOME DES PRATTLY CALLEDOUT TO THE DARKNESS, NIGHT HADFALLEN.HER HUSBAND'S CELL PHONE WASDEAD.THAT IS MY WORST NIGHTMARE.I NEVER NEAT WAY BEFORE.NEVER WANT TO FEEL THAT AGAIN.WE HAD TO HURRY UP AND GET BACK.REPORTER: SIX-YEAR-OLD ADMITS HEWAS TIRED, BUT THAT IS ABOUT IT.>> NO RATTLESNAKES OR ANYTHING.REPORTER: BUT THERE IS ALLTUNEDS OF ANNUALS THAT HAVEFEET.REPORTER: SOUTH BRIM POLICE HAVEBULLHORNS AND K-9S.>> SHE CALLED EVERY SINGLE COPIN THE WORLD.REPORTER: SHE WAS WORRIED.SHE DID.REPORTER: POLICE ABLE TO GUIDETHEM OUT OF THE VALLEY.EYE BOUGHT IT AND NEVER THOUGHTI WOULD USE IT.>> Reporter: IN LARGE PARTBECAUSE OF A SURVIVAL BRACELET.EVERY TIME, I COULD HEAR THEM.REPORTER: FIVE HOURS LATER.>> ANOTHER TEN MINUTES WE WOULDHAVE BEEN STUCK IN 37-DEGREEWEATHER.REPORTER: FATHER AND STEPSONEMERGED A LITTLE WISER.WHAT WOULD YOU DO DIFFERENTLYNEXT TIME?>> GET A BETTER PHONE.MAKE SURE IT IS CHARGED.>> Reporter: HE IS EXPERIENCED.IF YOU VENTURE OUT TO THE WOODFOS A HIKE TO CAMP, MAKE SUREYOU LET SOMEONE KNOW EXACTLY